Drive-chain and wheel therefor.



W. J. BELCHER. DRIVE CHAIN AND WHEEL THBREPOR.

APPLIUATION FILED APR.8.1909.

Patented May 2 4, 1910,

The wntitm. fully ilustmtetin the acompmlylng dwwngs, in which,-

Fgulrj l is Sid@ evzttml of at part of tftwe Smwn he Chain uppliredx F2.is. it plan View 0i the out min shvmg the mummy: of as lig. 3 is itVig-w har twthed; Wheel 0i smaller i.. @ath mi? the salme height.states, and same ptchnss on wheat. .tg is :1 pmpactve ttimv, mewlmtenlarged. ont one Gif the side .s 'o hold @1min on the mot/hed whee, :3isnt4 smaf View o @me mit the drvmg links ci tu@ chain.

H...tof "e, dri akmus Gf the tg/'Qe ot th@ "Ling the subjffct of this:tp- 'flizetti im, 'that is, chains which ilave :1. plasir timeenggzrgcment with a tumthed wheel. hat@ Mj/ baten constructed with inkshaving; pm" btwt the teeth. on the wheel.

"Whm 'the :he ints @we made to itt in betwfen th@ teth the Wheel. Lessnng @i diam @tmfozt the Wheel results in. .at mecsstztrcy; uh... l nth@ themess of the meth7 that is? they must be mnd@ thimez; W.11el:@znswith the inm @important m1 one meth.. :time and. amt of Contact with anyiDtff moth. the. teeth may all have the Same th@ l.. dental @pauses willvauy :ts dascrbfe fm'they; on. This ulvovss tu@ usa of a- Mfctfm;ttt-ewan t@ t into the space being diswgaavded. :md in which, game@ ntlyspenkxg, the .auguauty of th@ Sdtts of theta spztcos between the methwill wmf] as the malins of the Wheelvares, though @they i'actmfs alsomust bef taken int-@conadamton. This constructing of the aothfsd wheel,twv/ever, forms .no pfut ofthe pres ent invention.

By "che use o?? at chain land. toothgd whee made :as desm'be, andshownin this :.1pplcatml the cntour- @t th@ tooth in @ms Section, that is, asectn taken in the plume of tha WMM, @was not vany in Wheds Of differentdameteus, and the Same ink memben can b@ ua. @it Wheels having varyingdamieters Within a. mut geutex range than has been possibi@ heretofore,sa far @Si mirare., fhws th'sfore that with a chain. made desmibad; andshown herein), it many be @Appld to astmight mak or m a @113.51931hittug the sst p osbe Rumba. teeth without nesstatng :my chzmge Whitteveim th@ mm of the teeth of either rank or pnml.

In. llustlfathm of this7V 1st it be assumed,

for' examp/apbhat wehmve two Wheels-@flev having. sixtymur teath and.the other eighteettf-mth of ourse naming the same pitch, auch toothbeing-j 9:5 the sam@ height and. the frantand back. sds of @ach toothhwving the same aug-gie relative to at Radial line dmavn through thecenter of the tooth By comparingth@ spac between th@ teethy of thesixtjou towth Whel. which may. be zsgume.' to. be @presented by .Fig 1,.with the spaces im. the 18 tathe Wheel, nemesented in 3, it wilt be seenthat the an guhmty of the bask side oi"- one tooth and the-trant Side otthe next relativo to :traditi/1 line attending through the Centex* ofth@ S3210@ betwesn twoieeh, will be gveater in the fights@ toothevslhel.L than. in the sixtymu taothed, wheel; wucht fact may be clearlydemonstwted by' the extensma Alll That is to say, the bottom of thespace between two teeth will be narrower in the smaller wheel than inthe larger.

l'elerring to the drawings 'forming part ol this appliration,. aindicates a toothed wheel adapted to receive a chain made according tothis invention; and b a similar toothed wheel ot smaller diameter.

indicates the teeth of these wheels; d the angular sides of the teethI`and e the bottom ot the space between two of the teeth c.

ndieates the driving links of the chain as a .vhole, and f/ the two endportions ot the links which extend into the spaces between the teeth,the inner edge ot' each of said end portions y being finished oil at ananglo substantially equal to the angle of the sides l ol" the teeth. Vl'loles /t in each end of the links receive the pins i.: on which thelinks swivel.

The ehain-retaining links, located along the :sides ot the chain, areindicated by lm, and are provided on the lower side thereof with the'if-shaped centrally disposed extensions o, and are supported on thepins /c in such position that thel parts 0 thereoi2 will, when the chainis ruiming over the toothed wheel, overlap the ends of the teeth c thuspreventing any lateral motion of the chain during its movements. vTheseside links m which retain the chain in position, do not, olf themselves,constitute any part of the in venlion and are included .in theapplication only as well known elements for the purpose described.

'lhc links fof the chain are 'made as shown inthe drawings to lit overand rest on the crowns of the teeth, and if the wheel a for example, bedriven in the direction of the arrow, by means of the chain, the drivingcontact of' the latter will bc the forward edge et the rearmostdepending portion o et the link, bearing against the rear side of theinc-th c:

'Efhe link members are made ot the shape dei-willed to permit them toi'it over the ends ot 'the teeth on which they rest, each link sosupported on a tooth being out o'll contact with. any part of anothertooth. Thus when we link members seated on contiguous teeth are viewed`troni the side, as in Fig. l, their ions ends will overlap and the.deportions g thereoil will substanthe space between said teeth, and otthe location ofthe pins c con- 'lhe pivotal points of these link at apoint netfirer to the top of the teeth than tothe bottom oi' the spacebetween the depending portions y/ of the will., as the chain is flexed,

te movement, which per- Aant themselves to the varying angnlarity of thespares between the teeth, which results from a variation in the radiusof the Wheel. These portionsA o however `are always out of contact withthe bottom of the spaces between the teeth.

By making the links of the drive-chain of the saddle form shown, itbrings the holes it tlnough a\'li ich the pins k pass, directly over theproJectmg portions g of the links, in other words on that part of thelink Where there is the most metal; therefore, these holes may be sopositioned as to provide the 'greatest possible cross sectional areabetween the holes z, and the adjacent border of the links, and as aresult of this characteristic, it has been possible to ver nearly doublethe resistance to fracture o a chain constructed as herein described, ascompared with a similarly constructed chain having links so made as tofit between two teeth, or in other words constructed substantially ofthe same form as the links m. A further and important advantage of theform of link shown in Fig. 5 is that it permits the pivotpin to belocated very close to the periphery of the wheel7 thereby reducing thestress on the links, and permits the disposition of the metal betweenthe holes h of the'link members in a straight line.

The chain is assembled in the usual manner, as shown in Fig. 2.

The construction of driving pulleys of the character described herein bythe method herein set forth greatly simplifies and cheapens theirconstruction and provides means lwhereby the same chain may be .made torun perfectly over pulleys having Widely vary ing diameters.

If the chain were constructed of link members like those shown in Fig.4, to fit into the space between two teeth, this would not be possiblefor the reason that said space varies with every var1ation of thediameter of the wheel.

What I claim, is

l. A chain-driving mechanism consisting of a toothed wheel and a chainof pivotally connected links, said links having depending end portionswhereby recesses are provided to tit the ends of the teeth, the linkmembers beingadapted to be seated asti-ide of the teeth which theydrive, the pivotal points of the links being locate-d nearer to theyends of the teeth than to the botlonr ntl/the spaces between the teeth.`

2. A chain consisting of pivotally connected links, tlliemetal betweenthe pivotal points of the ink members being disposed in a straight line,the link members having end portions extending one side of said straightline to constitute a tooth receiving recess, each link member beingadapt d to be seated astride of the tooth which it drives.

il. A toothed wheel and a drive-'chain of pivot-,ally connected linkmembers each adapted to-be seated on the end of the tooth the toothwhich it drives, the meta between lo which it drives, out of ContactWith any the pivotal points of the chain being dsother tooth, thepivotal points of the link posed a straight line over the ends of themembers being nearer to the ends of the teeth.

teeth than to the bottom of the spaces bel l tween the teeth WARREN J.BELCHLR.

A. toothed Wheel and a drve-ohain of W'itnesses: pivotaly connected linkmembers, each mem K. I. CLEMoNs,

ber bemg adapted to be seated astride of HARRY W. BowEN.

